Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b23726b6e651ba…

MALICIOUS

PDF

85.0 KB Created: 2021-08-21 11:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1e7c704c717a65d971f55f85958e4999 SHA-1: 3e28f4bae1fcd668b6279bd0544456b6cb088183 SHA-256: 42b23726b6e651badb533f3231219496700d813600c9a09b8317ac31a6c47b87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads, suggesting it's used to redirect users to malicious sites. The PDF structure and numerous unknown URLs reinforce its role as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b229029c695---fawekogo.pdf In PDF document text
    • http://bajcsidavidfoto.com/_user/file/wonadavobofedo.pdfIn PDF document text
    • http://email-database.info/userfiles/file/96470472960.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04b27fc38---tefikolobunaxal.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/88222317280.pdfIn PDF document text
    • http://kdekdyjak.cz/data/newedulelulemasel.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/50908339234.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7dcfe94202---viluxubisitigizaziwax.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/temiwulo.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/14n5k01ep8lbfneei1rk1gd8od/sogofetofotuguna.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/26420554433.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/topevona.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/gimevedotodomezisuje.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5af925e1b---37720690924.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd63c666f8---12633552128.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/69778939651.pdfIn PDF document text
    • http://museeducuir.org/upload/files/geveretitimaworep.pdfIn PDF document text
    • https://mszukam.pl/dat//file/93133145559.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/46f6dafa9367896bf5cb96042de25ea6/negalelisuwu.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1d1240230b705adca8b7a4decf70ec98/dixofu.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/guzegubojetepovesiji.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/dudibesetitinidetevifun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=coronilla+a+san+miguel+arcangel+quien+como+diosPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 19936 bytes
SHA-256: 87e8dcd3d92b154dfd98a97263d180470909624db5419bc09dadfa56d62734f8
font_01_sfnt_off000114e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E4 10892 bytes
SHA-256: c8ad5277e10044206076f793a90c3f8e3228d721c888071990da36124ae8b65a
font_02_sfnt_off00012d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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